java定时执行servlet_Servlet中执行定时任务

import java.io.IOException;

import java.util.Timer;

import javax.naming.InitialContext;

import javax.naming.NamingException;

import javax.persistence.EntityManager;

import javax.persistence.Persistence;

import javax.servlet.GenericServlet;

import javax.servlet.ServletConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import org.apache.log4j.Logger;

import org.springframework.web.context.support.WebApplicationContextUtils;

import com.ibm.websphere.uow.UOWSynchronizationRegistry;

import com.ibm.ws.uow.UOWManager;

import com.ibm.wsspi.uow.UOWAction;

import com.ibm.wsspi.uow.UOWActionException;

import com.ibm.wsspi.uow.UOWException;

public class CronJobServlet extends GenericServlet {

private static final Logger log = Logger.getLogger(CronJobServlet.class);

private static UOWManager manager;

private static EntityManager em;

private XXJob clearXXJob;

@Override

public void init(ServletConfig config) throws ServletException {

initJob(config);

try {

InitialContext ic = new InitialContext();

manager = (UOWManager) ic.lookup("java:comp/websphere/UOWManager");

} catch (NamingException e) {

e.printStackTrace();

}

try {

manager.runUnderUOW(

UOWSynchronizationRegistry.UOW_TYPE_GLOBAL_TRANSACTION,

false, new UOWAction() {

public void run() throws Exception {

Timer timer = new Timer();

timer.schedule(clearXXJob, 2000,1000);

}

});

} catch (UOWActionException e) {

e.printStackTrace();

} catch (UOWException e) {

e.printStackTrace();

}

}

private void initJob(ServletConfig config) {

em = Persistence.createEntityManagerFactory("xx")

.createEntityManager();

final CronJobService cronJobService = (CronJobService) WebApplicationContextUtils

.getWebApplicationContext(config.getServletContext()).getBean(

"cronJobService");

cronJobService.setEntityManager(em);

clearXXJob = new ClearXXJob(cronJobService);

}

@Override

public void service(ServletRequest arg0, ServletResponse arg1)

throws ServletException, IOException {

}

}